Such concrete that normally utilizes magnetite aggregate can have a density in the range of 3. Development of high performance heavy density concrete using. According to the recent study made by previous researchers 410, the highest density of. The main use of hdc is in the nuclear industry as radiation shielding. Concrete material properties the weight density of reinforced concrete using normal aggregates is about 150 lbft3 pcf. A study on mechanical properties of concrete replacing fine.
Apart from the variety of uses discussed, this investigation focuses on the use of high density concrete using iron ore for the productions of counterbalances utilized in washing machines. It is one of the fundamental properties used for quality control for lightweight concrete. Concrete masonry offers almost limitless combinations of color, shape, size, strength, texture, and density. High density concrete is also known as heavy weight concrete. High density concrete can only be manufactured by using various high density natural or manmade aggregates. The american concrete institute standard building code aci 318 provides structural engineers. Following properties of high density concrete have been observed. For quality concrete, a proper proportion of water to cement is essential.
The high density concrete has a better shielding property, so that it can protect harmful radiation 9. Experimental study on heavy weight concrete using hematite. These values fall within the density values for normal weight concrete as stated by neville 2000. High performance concrete is often nomically made while used in bridges left and tall buildings right. The concrete protecto r high density polymer resin concentrate is a low odor acrylic polymer designed for modifying the concrete protectors texture m ix. The radiation shielding quality of concrete can be increased by increasing its density. Properties of concrete workability, setting, bleeding. For this purpose high density rocks magnetite, iron glance, barium sulfate, etc. The variation is seen in the tabulation given in the table below.
Jan 01, 2016 ultra high strength concrete uhsc is the latest spectacular development in the domain of portland cementbased materials. For concrete with normal percentage of reinforcement or prestressing steel. Production of an economic highdensity concrete for shielding. Nanoparticles act as excellent filling agents through the refinement of intersection zones in cementitious materials and production of high density concrete. High density concrete heavy weight aggregate lkab minerals. Type iii is a high earlystrength cement which will develop higher strength at an. The dry density of foamed concrete may vary from 300 to 1600 kgm3. High density concrete is used extensively in nuclear power plants for radiation shielding against biological hazards.
High density concrete, high strength concrete and high performance concrete. Jan, 2016 high value concrete reactivepowder concrete rpc properties. Influence of recycled waste high density polyethylene. Foam concrete materials, properties, advantages and. High strength 200 mpa can be produced to 800 mpa very low porosity properties are achieved by.
This tek illustrates the various physical and design properties in. Development of highperformance heavy density concrete. Pdf on dec 2, 2008, sriravindrarajah rasiah and others published properties of adjusted density high strength concrete find, read and cite. Concrete material properties for concretes up to about 6,000 psi it can be approximated as. Use of scc in high density concrete repairs targeted 4,000 kgm 3wet density. Since hematite has higher density than plain concrete. Mar 01, 2015 heavyweight and high strength concrete can be used for shielding purposes if it meets the strength and radiation shielding properties. These properties vary significantly with temperature and also depend on the composition and characteristics of concrete batch mix as well as heating rate and other environmental conditions. However, little information on properties of hematitecontaining concrete other than radiation shielding. The paper has been prepared jointly by konstantin kovler and nicolas roussel, while the second author was in charge of the properties of fresh concrete, and the first author. By adding steel fibre to concrete, it has improved its mechanical properties including the drying shrinkage, thermal conductivity and modulus of elasticity. If 5 pcf of this is allowed for the steel and w is taken as 145 pcf then. Depending on the application and your required density, you can use one of the several magnadense grades lkab minerals has available. The bulk properties and packing model structure of concrete can remarkably be improved by the incorporation of nanoparticles.
The high density concrete has a better shielding property, so that it can protect harmful radiations like xrays, gamma rays, and neutrons. Concrete production an overview sciencedirect topics. Density of concrete density of fresh concrete made of normal aggregate, barites aggregate and steel fiber shown in figure1. Design and development of high strength heavyweight. Concretes containing hematite for use as shielding barriers. For instance expanded polystyrene eps based waste, high density polyethylene hdpe, polyethylene terephthalate pet waste bottles, polypropylene fibers and polyethylene bags have all been used in different forms by researchers in concrete. Jun 18, 2018 applied alone, dispersed in a structural material, such as concrete, dispersed in a polymer and molded into custom shapes, or layered to maximize the effectiveness for shielding mixed sources of radiation. Mechanical properties of high strength concrete containing coal. Approximate values for the modulus of elasticity e cm secant value between. The characteristic compressive strength f ck is the first value. The physical properties of the foam concrete are clearly related to the dry density. The elastic deformation properties of reinforced concrete depend on its composition and especially on the aggregates. A study on mechanical properties of concrete replacing. Pdf technical and economical efficiency for application of.
High density concrete, high strength concrete and high. Development of highperformance heavy density concrete using. Portland cement association with steel or other high strength material is known as reinforced concrete. Methodology the study on the characteristic properties of concrete by the partial replacement of cement and aggregate by fly ash, micro silica and recycled aggregate is to pack the concrete with optimum density with less number of pores which will increase. Other types of heavy weight aggregates that are used to produce medium to low density concrete are barite, magnetite, limonite, goethite, and ilmenite. Ef 57,000 c concrete material properties effect of voids in concrete on modulus of elasticity, compressive strength, and flexural strength civl 1101 introduction to concrete 510. Design and development of high strength heavyweight concrete. Table 4 shows density of concrete cubes ranging from 2441kgm. Gamma ray attenuation properties of common shielding. This is required to make the concrete plastic and more workable. In view of gaining popularity as a construction material, high strength concrete hsc properties are discussed in this paper. In this experiment, mixes as in table 3 were used to obtain the maximum density of concrete. Its properties make concrete an excellent choice for structures, cladding systems and floor slabs. Table of concrete design properties fcd, fctm, ecm, fctd.
High density concrete is a concrete having a density in the range of 6000 to 6400 kgcu. Pdf properties of fresh and hardened concrete konstantin. It is known that to call a concrete as high density concrete it should have density more than 2600 kgm3 density. Fire response of concrete structural members is dependent on the thermal, mechanical, and deformation properties of concrete. Influence of recycled waste high density polyethylene plastic. Concrete as a construction material are grouped as normal concrete or high strength concrete based on its compressive strength. As the name suggests, the density of this concrete varies from 3360 kgm 3 to 3840 kgm 3, whereas the density of normal concrete is of the order of 2400 kgm 3. Design values of concrete material properties according to en199211 unit weight the unit weight of concrete. Pdf properties of heavyweight concrete for structural. Highperformance concrete, chapter 17 civil engineering. Compressive strength may be defined as the measured maximum resistance. The high density concrete has a better shielding property, so that it can protect harmful radiations like xrays, gamma.
On the other hand, concrete is widely used for radiation shielding. The material shall be a high density polyurethane system with the following physical characteristics and properties. In practice, re resistance of structural members used to. Reduces the effectiveness of a 6 block thickness to the same as a 4 block. High density concrete can be used for structural andor specialised construction purposes. By eliminating the coarse aggregate, improving the packing density of powders with specific grainsize distributions and using water curing at 90 c, it is possible to increase uhsc compressive strength to over 200 mpa when using mineral powders, 270 mpa with glass. Compressive strengths from 30 psi to 100 psi 210 kpa to 690 kpa meet the requirements of nearly every application. Bickley and fung 2001 demonstrated that 40 mpa 6,000 psi high performance concrete for bridges could be ecofig. For a given unit configuration, the fire resistance of a concrete masonry wall increases as the concrete density decreases. Concrete specimens prepared with magnetite, datolitegalena, magnetitesteel, limonitesteel and serpentine were simulated. Properties of different grades of concrete using mix. Use of water reducing admixture in high density concrete increase workability reduces water requirement reduces cement content requirement high early strength the high density concrete has a better shielding property, so that it can protect harmful radiations like xrays, gamma rays, and neutrons. Cement provides limited strength not that useful in high density concrete used as binding material water aggregates admixtures 3.
High density concrete is mainly used for the purpose of radiation shielding, for counterweights and other uses where high density is required. Lkab minerals offers a blend to be used to produce high density selfcompacting concrete. High density radiation shielding concrete applications in. Mixing magnadense into concrete with other aggregates allows you to produce even heavyweight concrete with densities up to 5. The strength of this concrete measured on standard cylinders has been found 42 mpa at 28 days for a watercement ratio 0. Properties of high density concrete astm international. Elastic compatibility of high strength lightweight concrete poissons ratio maximum strain capacity seismic ductility 7. High density concrete high density heavyweight density should be more than 2600 kgm3 dens crete offers more strength can be used everywhere, in all construction practices resistant to extreme weather 2. Cba and opbc sands had similar grading to normal sand but have lower density and higher water absorption. Have high flow properties optimize density be stable no segregation prevent or mitigate shrinkage reduce the overall labourcomponent schedule use of scc in high density concrete repairs. Densities as high as 6 tm3 is also referred in literature. Figure 1 shows the polyethylene fiber used in this research and tables 1,2,3 and 4 shows the properties of the material. Properties of selfcompacting highstrength concrete containing. Aggregates for high density concrete for radiation shielding are iron shot and steel punching which are utilized to produce substantially high dense concrete.
Studies on high density concrete using iron ore for. Pdf mechanical properties of high density concrete used in fast. Pdf properties of adjusted density high strength concrete. Highdensity concrete reinforced with steel fibre at.
This formula and these characteristics must be certified by the manufacturer. The main aim of this paper deals with the high density concrete that means to get the maximum density by using the locally. Pdf this paper deals with the characterization of typical high density concrete used in fast reactors for structural and shielding purposes. Mechanical properties of highstrength concrete subjected to high temperature by stressed test. High density concrete blocks learn more about high density concrete blocks 2 approx. The high strength lightweight concrete with an average density less than 1500 kgm3 is characterized by strength more than 40 mpa specific strength. Typical properties of foamed concrete in its hardened state. To obtain the high strength and durable concrete by particle packing method. Celfort and foamular high density insulation boards are available in a variety of thicknesses and standard sizes.
Mechanical properties of ultrahigh performance concrete. This paper will focus on the 18002200 kgm3 1127 lbft3 density range. Design mix for obtaining high density mix mix identity cement kg river sand kg crushed granite kg 11. The concrete with density up to 3004 kgm3 was obtained for hematite concrete and density up to 2663 kgm3 was obtained for laterite concrete. Heavyweight and high strength concrete can be used for shielding purposes if it meets the strength and radiation shielding properties. Introduction the high strength polymer concrete is to reduce the inherent porosity of the concrete, to improve the strength and other properties of concrete.
The workability of foamed concrete is very high and have a slump value of 150mm to collapse. High density concrete using fly ash, micro silica and. The density of light weight concrete is about 1900 kgm 3 and that of normal concrete about 2400 kgm 3. Keywords high density concrete, hematite, laterite, radiation shielding, density.
High density concrete was mainly used in the construction of nuclear power plants, rail sleepers, counter wait for lifting cranes and in many other structures also. Also, concrete made with magnetite fine aggregate has higher physicomechanical properties than those containing barite and goethite. The elevated temperatures used in the test appreciably impaired the neutron and gamma attenuation properties of the two high density concretes. High density polyethylene hdpe, polypropylene pp, high strength polymer concrete, compressive strength. Review article properties of concrete at elevated temperatures. Over 35% less effective in preventing radiation streaming. Properties of different grades of concrete using mix design. Gamma ray attenuation properties of common shielding materials. The unit geometry affects the effective or equivalent unit thickness. Depending on the application and your required density, you can use one of the. The hardening of concrete before its hydration is known as setting of concrete. Pdf designing of high density concrete by using steel.
Nonetheless, the concretes would serve as satisfactory shield material if the reduced attenuation efficiency at the elevated temperatures were taken into account in the original reactor design. It can be seen that the densities of the specimen increase with the days of curing, which suggest that there is no deterioration of the said concrete. In this chapter, the key characteristics of concrete are outlined. The properties of the end product depend not only on the various constituent.
Weak, friable, or laminated aggregate particles are undesirable. Workers placing and vibrating concrete on a bridge deck including epoxycoated reinforcing steel. To provide detailed properties of the concrete, this study also discusses two heavy concrete types s50 and s100 from scientific publication designing of high density concrete by using steel. The test results show that at room temperature, the 56day compressive strength of the uhpc1 mix was 155. With the correct mix design, highdensity concrete can still achieve good workability. The properties of high density plastics fibers shown in table 3, this fibers used as percentages of volume of concrete with ratios of 0%,0. The other important requirement of radiation shielding concrete is its structural strength even at high temperature. High performance concrete hpc exceeds the properties and constructability of.
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